1. Turn on the ignition and rear window heater.
2. Press the positive probe of the voltmeter to the positive terminal of the lattice of the heating element, a negative dipstick push to the ground terminal. The device must register the battery voltage, otherwise check the condition of the fuse, switch and connecting wiring. If the voltage is normal, however, part of the heater does not operate. Go to the next phase of testing.
 | 3. In order to measure the voltage in the course of inspections described below, wrap the positive probe of the voltmeter metal foil, which is then easily be pressed with your finger directly to the electrically conductive filament lattice heating element. Negative probe, connect the meter to the ground terminal array. |
 | 4. Measure the pressure in the central portion of each of the filaments of the lattice. Display 5 ÷ 6 shows the state of health of the thread. A zero reading indicates the presence of yarn breakage between the center and the positive side of the element. Oversize indications half (10 ÷ 12) occurs if there is continuity between the center of the thread and the negative side of the element. Alternately, check each of the strands of the grid. |
5. If there is no continuity, connect the negative probe to the mass of the chassis and check again - testimony should not be changed, otherwise there is a violation of the quality of the grounding grid.
6. To locate the break push the negative lead of the voltmeter to the negative terminal of the heating element lattice. Wrap foil positive start probe to probe Conductive thread lattice, moving from the power supply to ground. At the point of breaking the instrument reading to fall from a few volts to zero. |
